Computer Science
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hstc.work..250c&link_type=abstract
The 1997 HST Calibration Workshop with a New Generation of Instruments, p. 250
Computer Science
Cosmic Rays, Sensitivity, Cameras, Near Infrared Radiation, Radiation Effects, Radiation Detectors, Imaging Spectrometers, Image Processing, Pixels, Telescopes, Thermal Vacuum Tests, Data Processing
Scientific paper
Near-Infrared Camera and Multi-Object Spectrometer (NICMOS) dark frames obtained during Servicing Mission Observatory Verification (SMOV) were used to derive the sensitivity of the detectors to cosmic ray hits. The number of cosmic ray events (5 sigma detections) is about 1.2-1.6 events/camera/sec, comparable to the WFPC2 detection rate for the same detector area. The mean size of the 5 sigma cosmic ray hits is 1.65 to 2 pixels, similar to the value measured during the NICMOS System Level Thermal Vacuum (SLTV) experiments. The number of pixels affected by cosmic ray hits is between 2 and 3 pix/camera/sec. This value depends on the position of the telescope relative to the South Atlantic Anomaly (SAA), and variations up to 60% in the rate of affected pixels have been observed between different dark frames during the same orbit. Information in the affected pixels can be partially recovered with the use of the MULTIACCUM read-out mode. However, seldomly (once-twice per month), cosmic ray hits have been observed to persist between frames during an orbit.
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